@media (min-width: 1200px) {
  html {
    font-size: 20px !important;
  }
}

@media screen and (min-width: 992px) and (max-width: 1199px) {
  html {
    font-size: 16px !important;
  }
}

@media screen and (min-width: 768px) and (max-width: 991px) {
  html {
    font-size: 14px !important;
  }
}

@media only screen and (min-width: 480px) and (max-width: 767px) {
  html {
    font-size: 10px !important;
  }
}

@media only screen and (max-width: 479px) {
  html {
    font-size: 6px !important;
  }
}

.hd-nav ul li:nth-child(1) {
  border-bottom: 1px solid #1746E0;
}

.hd-nav ul li:nth-child(1) a {
  color: #1746E0;
}

html {
  overflow-x: hidden;
}

.endPage .logo {
  min-width: 60px;
  display: block;
  width: 20%;
  font-size: 1.875rem;
  font-weight: 1000;
  color: #1746E0;
  background-color: #fff;
}

.endPage::after {
  display: block;
  content: '';
  height: 3px;
  background-color: #ddd;
  float: left;
  width: 100%;
  min-width: 200px;
  position: absolute;
  margin-top: -1.6875rem;
  z-index: -1;
}

.container .demo .page-title {
  font-size: 1.625rem;
  color: #888;
}

.container .demo .first-page {
  height: 600px;
  position: relative;
}

.container .demo .first-page .welcome {
  height: 300px;
  position: relative;
  top: 50%;
  margin-top: -150px;
}

@media screen and (max-width: 768px) {
  .container .demo .first-page .welcome h1 {
    font-size: 3.75rem !important;
  }
  .container .demo .first-page .welcome p:nth-child(3) {
    text-align: right;
    font-size: 2.5rem !important;
  }
  .container .demo .first-page .welcome p:nth-child(2) {
    font-size: 2.5rem !important;
  }
}

.container .demo .first-page .welcome h1 {
  text-align: center;
  padding: 10px;
  font-weight: normal;
  font-size: 1.875rem;
}

.container .demo .first-page .welcome h1 .name {
  color: #1746E0;
}

.container .demo .first-page .welcome p:nth-child(3) {
  text-align: right;
  margin-right: 100px;
  font-size: 1.25rem;
}

.container .demo .first-page .welcome p:nth-child(2) {
  text-indent: 28px;
  font-size: 1.25rem;
}

.container .demo .first-page .welcome .startLearn {
  display: block;
  width: 160px;
  height: 48px;
  line-height: 48px;
  text-align: center;
  font-size: 1.375rem;
  font-weight: 1000;
  box-sizing: border-box;
  border-radius: 3px;
  background-color: #1746E0;
  color: #fff;
  text-decoration: none;
  position: relative;
  left: 50%;
  margin-left: -80px;
}

.container .demo .first-page img {
  height: 300px;
  position: relative;
  top: 50%;
  margin-top: -150px;
  display: block;
}

@media screen and (max-width: 768px) {
  .container .demo .first-page img {
    display: none;
  }
}

.container .demo .second-page {
  height: 666px;
}

@media screen and (min-width: 768px) and (max-width: 991px) {
  .container .demo .second-page .popular-courses:last-child {
    padding: 50px 0 !important;
    margin: 0 29.16666666%;
  }
  .container .demo .second-page .popular-courses:last-child p {
    font-size: 0.3125rem;
  }
}

@media screen and (max-width: 767px) {
  .container .demo .second-page .popular-courses {
    margin: 0 25% !important;
    padding: 0 !important;
  }
  .container .demo .second-page .popular-courses h3 {
    padding: 5px 0 !important;
  }
}

.container .demo .second-page .popular-courses {
  padding: 123px 0;
  text-align: center;
  margin: 0 4.16666666%;
}

.container .demo .second-page .popular-courses img {
  display: block;
  background-color: #fff;
  border-radius: 50% 50%;
  width: 150px;
  position: relative;
  left: 50%;
  margin-left: -75px;
  box-shadow: 0 2px 3px #ddd;
}

.container .demo .second-page .popular-courses .introduce {
  display: inline-block;
}

.container .demo .second-page .popular-courses .introduce .title {
  padding: 20px 0;
  font-size: 1.125rem;
}

.container .demo .second-page .popular-courses .introduce p {
  font-size: 0.5rem;
}

.container .demo .third-page {
  height: 666px;
}

.container .demo .third-page .zsk {
  height: 600px;
  position: relative;
  background-color: #E8F0F7;
}

@media screen and (max-width: 991px) {
  .container .demo .third-page .zsk .zsk-content {
    margin: -100px 4.13333333% 0 4.13333333% !important;
  }
  .container .demo .third-page .zsk .robot-shadow {
    display: none;
  }
  .container .demo .third-page .zsk .imge {
    display: none;
  }
}

@media screen and (max-width: 767px) {
  .container .demo .third-page .zsk .zsk-content {
    top: 0 !important;
    margin-top: 50px !important;
  }
  .container .demo .third-page .zsk .robot-shadow {
    display: none;
  }
  .container .demo .third-page .zsk .imge {
    display: none;
  }
}

.container .demo .third-page .zsk .zsk-content {
  height: 200px;
  position: relative;
  top: 50%;
  margin-top: -100px;
  object-fit: cover;
}

.container .demo .third-page .zsk .robot-shadow {
  position: absolute;
  bottom: 0;
  border-radius: 50% 50%;
  height: 50px;
  background-color: #2d9dff;
  box-shadow: 0 0 80px 60px #36abff;
  transform: rotateX(83deg);
}

.container .demo .third-page .zsk .imge {
  position: relative;
  top: 50%;
  margin: 0 4.13333333%;
  margin-top: -200px;
}

.container .demo .fourth-page {
  height: 666px;
}

@media screen and (max-width: 991px) {
  .container .demo .fourth-page {
    height: 300px;
  }
}

.container .demo .fourth-page .gy-content {
  margin-top: 120px;
  margin-bottom: 80px;
  height: 600px;
  position: relative;
}

@media screen and (max-width: 991px) {
  .container .demo .fourth-page .gy-content img {
    display: none;
  }
}

@media screen and (max-width: 767px) {
  .container .demo .fourth-page .gy-content {
    margin-top: 50px;
  }
  .container .demo .fourth-page .gy-content img {
    display: none;
  }
}

.container .demo .fourth-page .gy-content .gy {
  height: 300px;
}

.container .demo .fourth-page .gy-content .gy p {
  font-size: 1rem;
  color: #888;
  margin: 25px 0;
}
